If after pressing the power button on your C31 LLT, you notice the start-up sequence only flashing the red LEDs and there is no meter movement, then the tester may be out-of-cert.
There are five red flashes (once every half second), a (1 second), pause, then a solid red LED (for 1 second). The sequence then repeats until the Tester times-out or is turned off.
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